Lucent Technologies Lineage
®
2000 ECS Battery Plant H569-416
Issue 2 August 1996
Engineering, Planning & Ordering 3 - 15
Rectifier Sizing
The Lineage
®
2000 SR 50 ampere, -48 volt switched-mode
rectifier is currently available with the Lineage
®
2000 ECS
Battery Plant. The maximum number of rectifiers per plant is
twelve.
In the absence of specific customer practices, the following
procedure is RECOMMENDED.
s. Determine the smallest whole number of rectifiers that
will provide the normal (List 1) plant drain in Table
3-A: ____
t.
Determine the smallest whole number of rectifiers that
will provide the normal plus recharge
current from Table 3-A and (q): ____
u. provide the GREATER of (s)+1 or (t) rectifiers: ____
For batteryless plants, skip to paragraph “Initial and
Supplementary Bays.”
Battery Sizing
The battery type and minimum size are determined in
paragraphs “Battery Plant Voltage” and “Reserve Capacity.”
Many vendors offer families of batteries that cover a wide range
of ampere-hour capacities. Ampere-hour capacities of parallel
battery strings are added to provide the total reserve capacity of
the battery plant. To supply the necessary reserve, several strings
of small capacity batteries or one or two strings of large capacity
batteries may be connected in parallel.
There are several important considerations in the choice of
battery size versus number of strings, namely,
•
Cost,
•
Weight and Space Efficiency,
•
Anticipated Growth, and
•
System Reliability.
Cost: The cost per ampere-hour decreases with increasing cell
capacity. On the basis of initial material cost, the number of
strings should be minimized.
Weight and Space Efficiency: Weight density and space
efficiency increase as battery capacity increases. There can be
significant differences in space efficiency, however, between
